﻿#region License

// Copyright (c) 2013, ClearCanvas Inc.
// All rights reserved.
// http://www.clearcanvas.ca
//
// This file is part of the ClearCanvas RIS/PACS open source project.
//
// The ClearCanvas RIS/PACS open source project is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// The ClearCanvas RIS/PACS open source project is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
// Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// the ClearCanvas RIS/PACS open source project.  If not, see
// <http://www.gnu.org/licenses/>.

#endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;

namespace ClearCanvas.ImageViewer.StudyManagement.Core.Configuration
{
    public abstract class Broker
    {
        protected Broker(ConfigurationDataContext context)
        {
            Context = context;
        }

        protected ConfigurationDataContext Context { get; private set; }

        // taken from here: http://stackoverflow.com/questions/2910471/querying-a-single-column-with-linq
        public List<TResult> GetSingleColumn<T, TResult>(
            Expression<Func<T, bool>> predicate,
            Expression<Func<T, TResult>> select)
            where T : class
        {
            var q = Context.GetTable<T>().AsQueryable();
            if (predicate != null)
                q = q.Where(predicate).AsQueryable();
            return q.Select(select).ToList();
        }
    }
}
